Exhaust treatment apparatus for engine

Abstract

An exhaust treatment apparatus for an engine including a combustible gas supplying passage; a heat releasing port opened in an upstream side in the exhaust passage from the oxidation catalyst and in a downstream side in the combustible gas supplying passage, the exhaust passage and the combustible gas supplying passage communicating with each other through the heat releasing port; an ignition apparatus beneath the heat releasing port, the heat of flaming combustion of combustible gas ignited by the ignition apparatus being supplied to the exhaust passage to raise the temperature of exhaust in the exhaust passage; a flame holding plate in a downstream side in the combustible gas supplying passage from the ignition apparatus, an exhaust guiding plate at the top portion of the flame holding plate, the exhaust guiding plate having an upward slope toward a downstream side in the exhaust passage.

What is claimed is: 
     
       1. An exhaust treatment apparatus for an engine, comprising:
 an exhaust passage; 
 an oxidation catalyst that is disposed in the exhaust passage; 
 a combustible gas generator; 
 a combustible gas supplying passage that is disposed in parallel to and beneath the exhaust passage; 
 a heat releasing port that is opened in an upstream side in the exhaust passage from the oxidation catalyst and in a downstream side in the combustible gas supplying passage, the exhaust passage and the combustible gas supplying passage communicating with each other through the heat releasing port; 
 an ignition apparatus that is disposed beneath the heat releasing port, heat of flaming combustion of combustible gas ignited by the ignition apparatus being supplied to the exhaust passage to raise a temperature of exhaust in the exhaust passage; and 
 a flame holding plate that is provided beneath the heat releasing port in a downstream side in the combustible gas supplying passage from the ignition apparatus, wherein 
 an exhaust guiding plate is provided at a top portion of the flame holding plate, 
 the exhaust guiding plate is bent to form an upward slope toward a downstream side in the exhaust passage, and 
 the exhaust guiding plate covers the ignition apparatus from diagonally above, 
 a flame holding plate-equipped component that is equipped with the flame holding plate, the flame holding plate-equipped component being fixed by being clamped between an exhaust upstream side component and an exhaust downstream side component; 
 an exhaust upstream side gasket that is clamped between an exhaust upstream side face of the flame holding plate-equipped component and the exhaust upstream side component; and 
 an exhaust downstream side gasket that is clamped between an exhaust downstream side face of the flame holding plate-equipped component and the exhaust downstream side component, wherein 
 when the flame holding plate-equipped component, the exhaust upstream side gasket, and the exhaust downstream side gasket are seen from their respective exhaust upstream side faces, an exhaust upstream side leading piece that is led out toward an exhaust upstream side and an exhaust downstream side leading piece that is led out toward an exhaust downstream side are provided on one of right and left sides of the flame holding plate-equipped component, wherein 
 exhaust upstream side engaging pieces are provided on right and left sides of the exhaust upstream side gasket, respectively, 
 exhaust downstream side engaging pieces are provided on right and left sides of the exhaust downstream side gasket, respectively, 
 in a proper overlaid state where the exhaust upstream side gasket, the flame holding plate-equipped component, and the exhaust downstream side gasket are overlaid in this order from an exhaust upstream side having their respective exhaust upstream side faces oriented in an identical direction, the components are overlaid as being closely attached to one another, and 
 in an improper overlaid state where at least one of an overlaying order of the exhaust upstream side gasket, the flame holding plate-equipped component, and the exhaust downstream side gasket and an orientation of the components is different from that in the proper overlaid state, wherein at least one of the exhaust upstream side engaging pieces and the exhaust downstream side engaging pieces interfere with at least one of the exhaust upstream side leading piece and the exhaust downstream side leading piece, such that at least two components out of the overlaid components are not closely attached to each other. 
 
     
     
       2. The exhaust treatment apparatus for an engine according to  claim 1 , further comprising
 an engaging portion that is provided to one of the exhaust upstream side component and the exhaust downstream side component, wherein 
 in a proper clamped state where the components in the proper overlaid state are clamped between the exhaust upstream side component and the exhaust downstream side component as being properly oriented, the components and the components in the proper overlaid state are closely attached to each other, and 
 even when the components are in the proper overlaid state, when the components are in an improper clamped state where the components are clamped between the exhaust upstream side component and the exhaust downstream side component as being improperly oriented, one of the exhaust upstream side leading piece and the exhaust downstream side leading piece interferes with the engaging portion provided to one of the exhaust upstream side component and the exhaust downstream side component, such that one of the components and the components in the proper overlaid state are not closely attached to each other. 
 
     
     
       3. The exhaust treatment apparatus for an engine according to  claim 1 , wherein
 out of the exhaust upstream side face and the exhaust downstream side face of the exhaust upstream side gasket, and the exhaust upstream side face and the exhaust downstream side face of the exhaust downstream side gasket, a liquid sealing-out layer is provided only to the exhaust downstream side face of the exhaust downstream side gasket, 
 in a proper clamped state where the components in the proper overlaid state are clamped between the exhaust upstream side component and the exhaust downstream side component as being properly oriented, the liquid sealing-out layer is closely attached to the exhaust downstream side component, and 
 a liquefied product of the combustible gas that accumulates in an upstream side in the combustible gas supplying passage from the flame holding plate is sealed out by the liquid sealing-out layer. 
 
     
     
       4. The exhaust treatment apparatus for an engine according to  claim 2 , wherein
 out of the exhaust upstream side face and the exhaust downstream side face of the exhaust upstream side gasket, and the exhaust upstream side face and the exhaust downstream side face of the exhaust downstream side gasket, a liquid sealing-out layer is provided only to the exhaust downstream side face of the exhaust downstream side gasket, 
 in the proper clamped state where the components in the proper overlaid state are clamped between the exhaust upstream side component and the exhaust downstream side component as being properly oriented, the liquid sealing-out layer is closely attached to the exhaust downstream side component, and 
 a liquefied product of the combustible gas that accumulates in an upstream side in the combustible gas supplying passage from the flame holding plate is sealed out by the liquid sealing-out layer. 
 
     
     
       5. The exhaust treatment apparatus for an engine according to  claim 1 , wherein
 the exhaust upstream side gasket and the exhaust downstream side gasket are each made of a lamination plate, coupling portions of the lamination plates are provided to only one of right and left sides of the gaskets, respectively, and 
 in a proper clamped state where the components in the proper overlaid state are clamped between the exhaust upstream side component and the exhaust downstream side component as being properly oriented, each of the coupling portions of the lamination plates are positioned so as to avoid interference with an actuation component provided to the exhaust downstream side component. 
 
     
     
       6. The exhaust treatment apparatus for an engine according to  claim 2 , wherein
 the exhaust upstream side gasket and the exhaust downstream side gasket are each made of a lamination plate, coupling portions of the lamination plates are provided to only one of right and left sides of the gaskets, respectively, and 
 in the proper clamped state where the components in the proper overlaid state are clamped between the exhaust upstream side component and the exhaust downstream side component as being properly oriented, each of the coupling portions of the lamination plates are positioned so as to avoid interference with an actuation component provided to the exhaust downstream side component. 
 
     
     
       7. The exhaust treatment apparatus for an engine according to  claim 3 , wherein
 the exhaust upstream side gasket and the exhaust downstream side gasket are each made of a lamination plate, coupling portions of the lamination plates are provided to only one of right and left sides of the gaskets, respectively, and 
 in the proper clamped state where the components in the proper overlaid state are clamped between the exhaust upstream side component and the exhaust downstream side component as being properly oriented, each of the coupling portions of the lamination plates are positioned so as to avoid interference with an actuation component provided to the exhaust downstream side component. 
 
     
     
       8. The exhaust treatment apparatus for an engine according to  claim 4 , wherein
 the exhaust upstream side gasket and the exhaust downstream side gasket are each made of a lamination plate, coupling portions of the lamination plates are provided to only one of right and left sides of the gaskets, respectively, and 
 in the proper clamped state where the components in the proper overlaid state are clamped between the exhaust upstream side component and the exhaust downstream side component as being properly oriented, each of the coupling portions of the lamination plates are positioned so as to avoid interference with an actuation component provided to the exhaust downstream side component. 
 
     
     
       9. An exhaust treatment apparatus for an engine, comprising:
 an exhaust passage; 
 an oxidation catalyst that is disposed in the exhaust passage; 
 a combustible gas generator; 
 a combustible gas supplying passage that is disposed in parallel to and beneath the exhaust passage; 
 a heat releasing port that is opened in an upstream side in the exhaust passage from the oxidation catalyst and in a downstream side in the combustible gas supplying passage, the exhaust passage and the combustible gas supplying passage communicating with each other through the heat releasing port; 
 an ignition apparatus that is disposed beneath the heat releasing port, heat of flaming combustion of combustible gas ignited by the ignition apparatus being supplied to the exhaust passage to raise a temperature of exhaust in the exhaust passage; and 
 a flame holding plate that is provided beneath the heat releasing port in a downstream side in the combustible gas supplying passage from the ignition apparatus, wherein 
 an exhaust guiding plate is provided at a top portion of the flame holding plate, 
 the exhaust guiding plate is bent to form an upward slope toward a downstream side in the exhaust passage, 
 the exhaust guiding plate covers the ignition apparatus from diagonally above, 
 a flame holding plate-equipped component equipped with the flame holding plate at a supporting portion is provided, wherein 
 the supporting portion is fixed by being clamped between an exhaust upstream side component and an exhaust downstream side component, 
 cuttings are provided between the supporting portion and the exhaust guiding plate from a folding end side of the exhaust guiding plate toward a folding edge side, 
 cutting ends of the cuttings are ended before opposite sides of the folding edge of the exhaust guiding plate, and 
 the exhaust guiding plate is folded at the folding edge while leaving walls on opposite sides of the folding edge of the exhaust guiding plate, so as to form exhaust gas blocking walls on the opposite sides of the folding edge of the exhaust guiding plate. 
 
     
     
       10. The exhaust treatment apparatus for an engine according to  claim 1 , wherein
 the flame holding plate-equipped component equipped with the flame holding plate at a supporting portion is provided, 
 the supporting portion is fixed by being clamped between the exhaust upstream side component and the exhaust downstream side component, 
 cuttings are provided between the supporting portion and the exhaust guiding plate from a folding end side of the exhaust guiding plate toward a folding edge side, 
 cutting ends of the cuttings are ended before opposite sides of the folding edge of the exhaust guiding plate, and 
 the exhaust guiding plate is folded at the folding edge while leaving walls on opposite sides of the folding edge of the exhaust guiding plate, so as to form exhaust gas blocking walls on the opposite sides of the folding edge of the exhaust guiding plate. 
 
     
     
       11. The exhaust treatment apparatus for an engine according to  claim 2 , wherein
 the flame holding plate-equipped component equipped with the flame holding plate at a supporting portion is provided, 
 the supporting portion is fixed by being clamped between the exhaust upstream side component and the exhaust downstream side component, 
 cuttings are provided between the supporting portion and the exhaust guiding plate from a folding end side of the exhaust guiding plate toward a folding edge side, 
 cutting ends of the cuttings are ended before opposite sides of the folding edge of the exhaust guiding plate, and 
 the exhaust guiding plate is folded at the folding edge while leaving walls on opposite sides of the folding edge of the exhaust guiding plate, so as to form exhaust gas blocking walls on the opposite sides of the folding edge of the exhaust guiding plate. 
 
     
     
       12. The exhaust treatment apparatus for an engine according to  claim 3 , wherein
 the flame holding plate-equipped component equipped with the flame holding plate at a supporting portion is provided, 
 the supporting portion is fixed by being clamped between the exhaust upstream side component and the exhaust downstream side component, 
 cuttings are provided between the supporting portion and the exhaust guiding plate from a folding end side of the exhaust guiding plate toward a folding edge side, 
 cutting ends of the cuttings are ended before opposite sides of the folding edge of the exhaust guiding plate, and 
 the exhaust guiding plate is folded at the folding edge while leaving walls on opposite sides of the folding edge of the exhaust guiding plate, so as to form exhaust gas blocking walls on the opposite sides of the folding edge of the exhaust guiding plate. 
 
     
     
       13. The exhaust treatment apparatus for an engine according to  claim 4 , wherein
 the flame holding plate-equipped component equipped with the flame holding plate at a supporting portion is provided, 
 the supporting portion is fixed by being clamped between the exhaust upstream side component and the exhaust downstream side component, 
 cuttings are provided between the supporting portion and the exhaust guiding plate from a folding end side of the exhaust guiding plate toward a folding edge side, 
 cutting ends of the cuttings are ended before opposite sides of the folding edge of the exhaust guiding plate, and 
 the exhaust guiding plate is folded at the folding edge while leaving walls on opposite sides of the folding edge of the exhaust guiding plate, so as to form exhaust gas blocking walls on the opposite sides of the folding edge of the exhaust guiding plate. 
 
     
     
       14. The exhaust treatment apparatus for an engine according to  claim 5 , wherein
 the flame holding plate-equipped component equipped with the flame holding plate at a supporting portion is provided, 
 the supporting portion is fixed by being clamped between the exhaust upstream side component and the exhaust downstream side component, 
 cuttings are provided between the supporting portion and the exhaust guiding plate from a folding end side of the exhaust guiding plate toward a folding edge side, 
 cutting ends of the cuttings are ended before opposite sides of the folding edge of the exhaust guiding plate, and 
 the exhaust guiding plate is folded at the folding edge while leaving walls on opposite sides of the folding edge of the exhaust guiding plate so as to form exhaust gas blocking walls on the opposite sides of the folding edge of the exhaust guiding plate. 
 
     
     
       15. The exhaust treatment apparatus for an engine according to  claim 6 , wherein
 the flame holding plate-equipped component equipped with the flame holding plate at a supporting portion is provided, 
 the supporting portion is fixed by being clamped between the exhaust upstream side component and the exhaust downstream side component, 
 cuttings are provided between the supporting portion and the exhaust guiding plate from a folding end side of the exhaust guiding plate toward a folding edge side, 
 cutting ends of the cuttings are ended before opposite sides of the folding edge of the exhaust guiding plate, and 
 the exhaust guiding plate is folded at the folding edge while leaving walls on opposite sides of the folding edge of the exhaust guiding plate, so as to form exhaust gas blocking walls on the opposite sides of the folding edge of the exhaust guiding plate. 
 
     
     
       16. The exhaust treatment apparatus for an engine according to  claim 7 , wherein
 the flame holding plate-equipped component equipped with the flame holding plate at a supporting portion is provided, 
 the supporting portion is fixed by being clamped between the exhaust upstream side component and the exhaust downstream side component, 
 cuttings are provided between the supporting portion and the exhaust guiding plate from a folding end side of the exhaust guiding plate toward a folding edge side, 
 cutting ends of the cuttings are ended before opposite sides of the folding edge of the exhaust guiding plate, and 
 the exhaust guiding plate is folded at the folding edge while leaving walls on opposite sides of the folding edge of the exhaust guiding plate, so as to form exhaust gas blocking walls on the opposite sides of the folding edge of the exhaust guiding plate. 
 
     
     
       17. The exhaust treatment apparatus for an engine according to  claim 8 , wherein
 the flame holding plate-equipped component equipped with the flame holding plate at a supporting portion is provided, 
 the supporting portion is fixed by being clamped between the exhaust upstream side component and the exhaust downstream side component, 
 cuttings are provided between the supporting portion and the exhaust guiding plate from a folding end side of the exhaust guiding plate toward a folding edge side, 
 cutting ends of the cuttings are ended before opposite sides of the folding edge of the exhaust guiding plate, and 
 the exhaust guiding plate is folded at the folding edge while leaving walls on opposite sides of the folding edge of the exhaust guiding plate, so as to form exhaust gas blocking walls on the opposite sides of the folding edge of the exhaust guiding plate.